Police in Montgomery County have identified two people found dead in a Germantown home Monday morning and are investigating the incident as a murder-suicide.

Officers arrived at the 12900 block of Pinnacle Drive at about 8:49 a.m. in search of a missing juvenile that reportedly may have been at the address, said Angela Cruz, a spokeswoman for the county police department.

When no one inside the home could be contacted, police forced their way in at about 10:05 a.m. and discovered the bodies of a 31-year-old male and a 17-year-old female, Cruz said.

The man has been identified as Adam Anthony Arndt, who lived at the address, and the woman as Michelle Miller of the 5100 block of Russett Road in Rockville, according to a statement from the county police department. Investigators believe Arndt shot Miller and then shot himself, according to the statement.

Investigators determined that Miller and Arndt were acquainted because Miller planned to enlist in the U.S. Army Reserves after graduating from high school. Arndt was a staff sergeant in the Army, according to police.

A letter sent home with Rockville students Monday announced Miller’s death. She was a varsity lacrosse player and an honors/AP student, according to the letter, written by Principal Debra S. Munk.

Montgomery County Public Schools will provide counseling and support services to students starting Tuesday, Munk wrote.